For example, something like this: (variable name is a suggestion only)

[[module Rate]]
Average Rating %%rating%% from %%rating_votes%% votes

Could result in the following output:

* * * * *
Average Rating 4 from 15 votes

Notes:

If the + rating module was being used, it would equal the value of %%rating%%.

If the +/- rating module was being used, it'd be slightly more informative.

The real power of such a variable is obvious when using 5-star ratings.

Supplementary wish:

If it is easy to implement ordering by this new %%rating_votes%% variable, that'd be nice to have as well.

Popularity of a page can be judged based on how many people submitted a rating for it, and therefore we can order by popularity. (A page with a very low rating but many votes is still popular, even if for the wrong reasons!)